Google collections GWT jar

Has anyone had any luck rolling a custom GWT jar for Google Collections / Guava?开发者_开发百科 I've tried uncommenting the relevant ant tasks and running them, but I just get empty folders in the JAR. Can't seem to get the include rules right :-/

Remember that we intentionally don't provide this because the library does not work as it should on GWT. If you do it anyway, you might luck out, or you might not. We're working on this.